User's Manual Part 2

Nomad User’s Manual Chapter 8 – Analyzing the Results

Figure 8-32 - PESQ Tools GUI

The PESQ algorithm calculates MOS by comparing audio samples degraded by the communication

channel to the original source sample. Therefore, the PESQ Tools GUI requires both the original and

the degraded samples as inputs. To analyze a degraded sample:

1. Open the Reference File

 From the Ref File tab of the control panel, click on the Open button in the

Reference file path area.

 The standard audio scoring files are stored in the C:\Program Files\Spirent

Communications\Nomad\Audio Files directory. Select narr_usasts_107dB.wav for

narrowband handsets (8 kHz) or wide_usasts_107dB.wav for wideband handsets (16

kHz).

 The Hardware Sample Rate (8 kHz or 16 kHz) can be confirmed on the Nomad

Settings → Voice Quality tab.

Figure 8-33 - Ref File Tab